To confirm the movement of a large amount of Cl contained in the fly ashes in ashes from municipal solid wastes, we have come to the following conclusion, using CaCl_(2) generated through the SDA process. 1. The melting point of pure CaCl_(2) was 782℃ but the vaporization of it rose at more than 1,6...
To confirm the movement of a large amount of Cl contained in the fly ashes in ashes from municipal solid wastes, we have come to the following conclusion, using CaCl_(2) generated through the SDA process. 1. The melting point of pure CaCl_(2) was 782℃ but the vaporization of it rose at more than 1,600 and the more the pressure was, the higher the decomposing temperature was. The decomposing temperature of CaCl_(2) including H_(2)O was 800℃ and HCl was increased. After containing H_(2)O, the amount of HCl which CO was added in was smaller when CO=100% and O_(2)=100% were added than when O_(2) was added. 2. When basicity was adjusted to 0.2, 0.4, 0.6, 0.8, 1.0 the more the pressure of CaCl_(2) was, the higher the decomposing temperature of it was and Cl(g), Cl_(2)(g) were increased. In case that basicity ranged from 0.2 to 0.6 any change in CaCl_(2) was not seen. According to basicity the decomposing temperature of CaCl_(2) was about 1,200℃. On the other hand, in case that H_(2)O=30% was contained and basicity was 0.4 about half of CaCl_(2) was vaporized at about 550℃ and HCI was, in most part, produced without CaCl_(2)(g). In case that basicity was 1.2 about half of it was vaporized at about 750℃ and HCl was increased but the very small amount of CaCl_(2)(g) was contained. In case of CO=100%, 02=100% containing H_(2)O, HCI containing CO was low in the same form of CaCl_(2) The experiments were made from 1,000 to 1,400℃ and the following conclusion was reached, mixing CaO, SiO_(2), Al_(2)O_(3), CaSO_(4), with the use of CaCl_(2) through thermodynamical analysis and using the tube furnace with each basicity. 1. As the result that using TGA, the decomposing temperature of CaCl_(2) it reacted with H_(2)O at 100 ~ 200℃ and HCl was produced. It was decomposed actively at 1,200℃. 2. As the result that using the tube furnace, the condition of surface was checked, it was observed at 1,000 ~ 1,100℃ in the form of powder, not in the form of slag and the temperature needed to treat ashes by melting should be more than 1,300℃. 3. As the result that elements are analyzed through EDS 31.6 ~ 85.1% of CaCl_(2)(g) were contained and when basicity was 0.8 Cl began to decrease from 1,100℃. The higher the basicity was higher, the larger the amount of Cl was. 4. As the result that exhaust gases are analyzed the higher the temperature was, the larger amount of Cl_(2)(g) was but it began to decrease from 1,400℃. The higher the basicity was higher, it was decreased. Based on the results of the basic melting experiment the experiment on application to the site was carried out and the following experiment was reached. 1. Of ashes Cl of bottom ashes was analyzed as 1.32% and that of fly ashes as 17.14%. 2. As the result that the temperature of melted slags were measured on application to the site they were melted at 1,300±50℃ 3. The inner temperature of the melting furnace was 60 ~ 140℃. 4. The density of HCl was 0.681 ~ 0.952 ppm. 5. As the fumes produced from melting were analyzed KCl, CaCl_(2) occupied more than 90%. Of the ashes of municipal solid wastes Cl generated from fly ashes was reproduced through the melting process. As most of the Cl is vaporized it can be the most idealistic that Cl remains on slags. The inner temperature of a general melting furnace is very high and it discharges exhaust gases. But in case of the cold top process used for the experiment on application to the site the melting furnace descends the temperature of vaporized Cl again, holding the low temperature of 80 ~ 150℃. So the Cl exhausted as gases exists on slags.
To confirm the movement of a large amount of Cl contained in the fly ashes in ashes from municipal solid wastes, we have come to the following conclusion, using CaCl_(2) generated through the SDA process. 1. The melting point of pure CaCl_(2) was 782℃ but the vaporization of it rose at more than 1,600 and the more the pressure was, the higher the decomposing temperature was. The decomposing temperature of CaCl_(2) including H_(2)O was 800℃ and HCl was increased. After containing H_(2)O, the amount of HCl which CO was added in was smaller when CO=100% and O_(2)=100% were added than when O_(2) was added. 2. When basicity was adjusted to 0.2, 0.4, 0.6, 0.8, 1.0 the more the pressure of CaCl_(2) was, the higher the decomposing temperature of it was and Cl(g), Cl_(2)(g) were increased. In case that basicity ranged from 0.2 to 0.6 any change in CaCl_(2) was not seen. According to basicity the decomposing temperature of CaCl_(2) was about 1,200℃. On the other hand, in case that H_(2)O=30% was contained and basicity was 0.4 about half of CaCl_(2) was vaporized at about 550℃ and HCI was, in most part, produced without CaCl_(2)(g). In case that basicity was 1.2 about half of it was vaporized at about 750℃ and HCl was increased but the very small amount of CaCl_(2)(g) was contained. In case of CO=100%, 02=100% containing H_(2)O, HCI containing CO was low in the same form of CaCl_(2) The experiments were made from 1,000 to 1,400℃ and the following conclusion was reached, mixing CaO, SiO_(2), Al_(2)O_(3), CaSO_(4), with the use of CaCl_(2) through thermodynamical analysis and using the tube furnace with each basicity. 1. As the result that using TGA, the decomposing temperature of CaCl_(2) it reacted with H_(2)O at 100 ~ 200℃ and HCl was produced. It was decomposed actively at 1,200℃. 2. As the result that using the tube furnace, the condition of surface was checked, it was observed at 1,000 ~ 1,100℃ in the form of powder, not in the form of slag and the temperature needed to treat ashes by melting should be more than 1,300℃. 3. As the result that elements are analyzed through EDS 31.6 ~ 85.1% of CaCl_(2)(g) were contained and when basicity was 0.8 Cl began to decrease from 1,100℃. The higher the basicity was higher, the larger the amount of Cl was. 4. As the result that exhaust gases are analyzed the higher the temperature was, the larger amount of Cl_(2)(g) was but it began to decrease from 1,400℃. The higher the basicity was higher, it was decreased. Based on the results of the basic melting experiment the experiment on application to the site was carried out and the following experiment was reached. 1. Of ashes Cl of bottom ashes was analyzed as 1.32% and that of fly ashes as 17.14%. 2. As the result that the temperature of melted slags were measured on application to the site they were melted at 1,300±50℃ 3. The inner temperature of the melting furnace was 60 ~ 140℃. 4. The density of HCl was 0.681 ~ 0.952 ppm. 5. As the fumes produced from melting were analyzed KCl, CaCl_(2) occupied more than 90%. Of the ashes of municipal solid wastes Cl generated from fly ashes was reproduced through the melting process. As most of the Cl is vaporized it can be the most idealistic that Cl remains on slags. The inner temperature of a general melting furnace is very high and it discharges exhaust gases. But in case of the cold top process used for the experiment on application to the site the melting furnace descends the temperature of vaporized Cl again, holding the low temperature of 80 ~ 150℃. So the Cl exhausted as gases exists on slags.
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